RHIC-STAR飞行时间谱仪.ppt

RHIC-STAR飞行时间谱仪 的进展 STAR Detector (baseline) Specific Energy Loss in STAR TPC STAR-TOF TOFr Tray 的结构 TOFr response efficiency vs particle transverse momentum Introduction to STAR-TOFr, MRPC *Shanghai Eastern Forum CHEN, Hongfang, USTC for STAR-China Time of Flight Project in STAR Introduction of Multi-gap Resistive Plate Chamber (MRPC) Prototype running in STAR Preparation for mass production in China (at USTC and Tsinghua) Conclusion Outline Time of Flight Project in STAR 80年代初物理学家提议建立高能重离子装置产生和研究QGP,高温QCD物质。 T.D.Lee提议在BNL利用ISABELLA的隧道来建造RHIC。1991年在BNL开始建造。 1999年建成，环周长3.8公里。加速金核最大能量100 GeV/Nu Large coverage ??2, ?? ~2? ZCal Barrel EM Calorimeter Endcap Calorimeter Magnet Coils TPC Endcap MWPC ZCal FTPCs Vertex Position Detectors Central Trigger Barrel or TOF Time Projection Chamber Silicon Vertex Tracker STAR p + p at 200 GeV data d d t p K p K p e e With the STAR TPC K p identification: pT ~ 0.6 GeV/c Proton identification: pT ~ 1.1 GeV/c S/N for f reconstruction: ~ 1/few 100 Multi-strange particles reconstruction efficiency: ~ 10- 4 --10-3 J. Ma, Yamamoto et al. Upgrade Requirements Keep (expand) the general STAR philosophy of large coverage High rate readout and DAQ Micro vertex detector for enhanced heavy quark ID Enhanced (higher momentum) PID barrel TOF High rate tracking capability and improved momentum resolution (TPC replacement, GEM technology) by R. Majka for STAR Barrel Time of Flight using Multi-gap Resistive Plate Chambers Goal: Cover entire outer barrel of TPC with affordable, high resolution TOF (0Φ2π, -1η1,?t100ps) Limits For PID 2σ PID TPC dE/dx TOF (η~0) TOF (η~1) π/K/P ~0.7 GeV/c ~1.6 GeV/c ~2.0 GeV/c (π+K)/p ~1.0 GeV/c ~2.6 GeV/c ~3.2 GeV/c d ~1.0 GeV/c ~4.0 GeV/c ~4.7 GeV/c With TOF, over 95% of the particles in the TPC acceptance will be Identified Good time resolution (